Caliper



June 16 1931 K.. KlssENDoRFER 1,810,427

CALIPER Filed July 7, 1923 www@ WHW www* @l -ff' u Attorney Cil y and increase tlieveciency of the device.`

yposed of a Patented June 16, 1931 raras f PATE i fr are naar. nissnnnoarnn, or oBERNnoRr-oN-THE-NECKAR, GERMANY, Serenna ro I/AUSER-ERKE AKTIEN GESELLSCHFT, Y OF MANY Application. mea iuiy 7,1928, serial No. i

va most reliable way with a viewto ensure del# icate adjustments and a smooth sliding of the two bars on and in contact with each Vother while beingadjusted so as to eliminate as far as possible the chance of failure l/Vith the above recited object in view reference is made to the following specicaton and annexed ydrawings in which there is ezhibited oneexample or embodiment of the invention which, however, is in no way intended as a limitation' upon the scope of the appended claims as it is to be clearly understood that variations rand modifications which fairly fall within the true scope of said claimsmay be resorted to whenfound expedient, the invention viewed from' its broadest aspect residing in the guiding member being a bipartite structure comguiding bar properly speaking and a braking bar cooperating therewith as will be described more in detail in the following speciication.

In the accompanying drawings forming a f part of this specication and wherein like reference symbols Y' designate like parts throughout the several views Figure yl is a'view in side elevation of a caliper constructed in accordance with the present invention;l Figure 2 is a view in cross-section taken on the line Ae-B ,of Figf ure l; Figure 3 ,is a similar view on an enlarged scale and withl certain part-s cut away, the illustrated parts showing in a more conspicuous manner the construction, arrangement and cooperation of the two bars constituting the bipartite structure herein-k before referred to; Figure 4t is a view in side elevationand in vertical cross-section of the guiding bar groove of the main bar m.

Athe width of thev portiona2 OBERNDORF-ON-THE-NECKAR,

CAMPER 291,063, and in Germany July 3o, 1927.

of the braking bar.

In the embodiment shown m and n'designate the two main or measuring bars, respectively, each provided'with a. jaw. The inside faces ofthe two bars m and n are recessed lengthwise to form dovetail-grooves inwhich a guiding bar a; and a braking bar are encased in the particular' manner clearly shown in Figure 3, so as to consti` Vtute the means for holding the bars m and a in assembledfposition but free for adjusting displacement-- The guiding bar L is firmly connected with the main bar n and comprises a dovetailportion al of greater width exactly corresponding to the width of the grooveoftheYV and Figure 5 is a similar view bar n, and a dovetail-portion a2 being integral with' earch other so as yto constitutea double dovetail-bar as shown. j

The dovetail-groove of the main bar m is 'of the samev width or cross-sectional area as that of the mainibar n and the dovetail portion @2.0i the guiding bar .a is housed in the The braking bar 2') is of less width than the of the latter or, in other words the difference in width of the two bars a and is equal or amounts tothe width of the portion-a', of the guiding bar a, .so that,

as the brake bar is of parallelopipedic cross,- sectioncorresponding, in angular respects,`to the dovetail configurationV or contour of the bara7 thevbar and the portion a2,supple *ment each other in iilling out the Vdovetailgroove ofthe mainbar m, as will be readily understood on inspeotionzof Figure 3.

It will be seen that the upper oblique side face of the brake-bar b, see Figure 3, engages the upper slanting surface of.v the groove of thev main bar m, while the lower oblique side face of the bar b which is in parallel relationship to the former, engages the counterface ofthe portion z2 of the guiding bar a,'when thev parts are duly assembled. For the purposeof clamping the bars inl anyk desired or adjusted position I "l ,employk conventional screw-bolts c1 acting to iXtlie main bar `mk in the usual manner so that a mere .detailed d@ guiding bar a by scription of the fixing means is deemed unnecessary. j

It is to be noted, however, that the required resilient co-operation of the parts will be realized in the embodiment shown by the provision of yielding washers Z on the stem of the screw-bolt 01. The latter are adapted to pass freely through openings of the main bar 'n and the bar a. with their heads substantially Hush with the outer surface of the bar n, and to engage in threaded bores or holes of the brake bar I). In the event that the screw-bolts slacken the two main bars. m and n still will be maintained in firm connection with each other due to the resilient pressure of thewashers and when the screw-bolts are unserved and the main bars or jaws are free to be displaced in any desired position, such displacement can be accomplished in. a thoroughly smooth manner.

In view of the foregoing a detailed description of the operation of the device is deemed unnecessary and is therefore omitted in the interest of brevity. Nor does it seem necessary to burden this specificationwith an exposition of the advantages which the invention possesses, for they will be apparent to those skilled in the art to which this invention pertains.

What I claim is:-

1. A caliper of the type referred t0, comprising two laterally co-operating main bars having jaws at their outer ends and a longitudinal groove in each of the two co-operating' surfaces of the bars, a guiding bar in the groove of one main bar, a brake bar in the groove of the other main bar, and means carried by the brake bar for releasably and adjustably interconnecting the bars.

2. A caliper of the type referred to, comprising two laterally co-operating main bars having jaws at their extremities and a longitudinal groove in each of the two co-operating surfaces of the bars, a stationary guiding barin the groove of one main bar, an extension ofthe said stationary bar engaging in the .groove of the other main bar, a brake-bar mounted in the groove of said other main bar, and means carried by the brake bar for releasablyl and adjustably interconnecting the bars together.

3. Acaliper of the type referred to, comprising two laterally co-operating main bars having jaws at their'extremities and a longitudinal dovetail groove in each of the two cooperatingsurfaces of the bars, a correspondingly dovetai'led, stationary guiding bar in nthe oove of one main bar, a dovetailed eX- tenslon-of-the said stationary bar engaging in the groove of the yother .main bar, a brakebafr of dovetail cross-section also mounted in thegroove of said other main bar with its one end face abuttingagainst one lateral faceof thegrooveand with -itsfother end face `engaging against the said extension, and means carried by the brake bar for releasably and adj ustably interconnecting the bars together.

4. In a caliper of the character set forth, including two laterally (2o-operating main bars provided with grooves and jaws at their extremities, the dovetailed interconnecting structure composed of two single members in the grooves, the one of double-dovetail crosssection and the other one of parallelopipediccross-section and means for adjusting the bars.

In testimony whereof I affix my signature.

KARL KISSENDORFER. 

